1. chmod is a command that changes modes or permissions of a file or directory

2.su is another command that allow you to log in as another user

3.sudo is a command that allows us to execute a command as a different user

4. the command chown is use to change the owners file

5.  passwd is use to change the password

6. ps is a command that lets you view a snapshot of the process

7.the command kill is use to remove the process that was being executed

8. printev is a command that displays a list of environmental variables